The naming conventions in the Outer Tracker system are based
on the scheme illustrated in the LHCb note
LHCb-2003-041.
In that note was established a convention for the addressing
of the FE electronics, summarized in the figure below, and
essentially based on a geographical subdivision of the OT system
in:
3 stations: T1, T2, T3;
4 layers: L0 (X), L1 (U), L2 (V), L3 (X);
4 quarters: Q0, Q1, Q2, Q3.
The main point of the convention established in the
LHCb-2003-041
is that it is geographical: one does not refer to
a given module (resp. a FE Box) by an incremental number from 1 through 216
(resp. from 1 through 432); rather this is identified by
geographical references:
in what station (T1/T2/T3) ?
in what layer (L0/L1/L2/L3) ?
in what quarter (Q0/Q1/Q2/Q3) ?
If one looks
from an infrastructural point of view, the main detector units are the so called
C-Frames
(a detailed description
can be found at the section on the
OT Station Design).
The figure below is a top view showing
a schematic overview of the OT C-Frames on the two sides
(conventionally called "A" and "C")
of the beam line. In the figure are indicated explicitly the
corresponding station, layers, and quadrants of each C-Frame.
From the station, layers and quadrants of each C-Frame indicated in the
figure above becomes quite obvious the following naming convention established
for the C-frames:
T1-Q02-XU
T1-Q02-VX
T2-Q02-XU
T2-Q02-VX
T3-Q02-XU
T3-Q02-VX
T1-Q13-XU
T1-Q13-VX
T2-Q13-XU
T2-Q13-VX
T3-Q13-XU
T3-Q13-VX
In this naming convention,
"Q02" (resp. "Q13")
indicates that the C-Frame in on the
"C" (resp. "A")
side of the beam line, and
"XU" (resp. "VX")
indicates that the C-Frame contains
the module layers
"L0" and "L1"
(resp. "L2" and "L3").
